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Identifying percolation phase transitions with unsupervised learning based on largest clusters
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-01-28 DOI: 10.1016/j.physleta.2024.130179
Dian Xu , Shanshan Wang , Weibing Deng , Feng Gao , Wei Li , Jianmin Shen
{"title":"Identifying percolation phase transitions with unsupervised learning based on largest clusters","authors":"Dian Xu ,&nbsp;Shanshan Wang ,&nbsp;Weibing Deng ,&nbsp;Feng Gao ,&nbsp;Wei Li ,&nbsp;Jianmin Shen","doi":"10.1016/j.physleta.2024.130179","DOIUrl":"10.1016/j.physleta.2024.130179","url":null,"abstract":"<div><div>The application of machine learning in the study of phase transitions has achieved remarkable success in both equilibrium and non-equilibrium systems. It is widely recognized that unsupervised learning can retrieve phase transition information through hidden variables. However, using unsupervised methods to identify the critical point of percolation models has remained an intriguing challenge. This paper suggests that, by inputting the largest cluster rather than the original configuration into the learning model, unsupervised learning can indeed predict the critical point of the percolation model. Furthermore, we observe that when the largest cluster configuration is randomly shuffled—altering the positions of occupied sites or bonds—there is no significant difference in the output compared to learning the largest cluster configuration directly. This finding suggests a more general principle: unsupervised learning primarily captures particle density, or more specifically, occupied site density. However, shuffling does impact the formation of the largest cluster, which is directly related to phase transitions. As randomness increases, we observe that the correlation length tends to decrease, providing direct evidence of this relationship. We also propose a method called Fake Finite Size Scaling (FFSS) to calculate the critical value, which improves the accuracy of fitting to a great extent.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130179"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Beyond attraction: A novel approach to repulsive Casimir-Lifshitz forces using heterogeneous off-stoichiometry in gapped metals
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-01-28 DOI: 10.1016/j.physleta.2024.130162
S. Pal , S. Osella , O.I. Malyi , M. Boström
{"title":"Beyond attraction: A novel approach to repulsive Casimir-Lifshitz forces using heterogeneous off-stoichiometry in gapped metals","authors":"S. Pal ,&nbsp;S. Osella ,&nbsp;O.I. Malyi ,&nbsp;M. Boström","doi":"10.1016/j.physleta.2024.130162","DOIUrl":"10.1016/j.physleta.2024.130162","url":null,"abstract":"<div><div>We uncover a physical system that enables a switch between attractive and repulsive Casimir forces when a Teflon surface interacts with a new form of quantum material (i.e., gapped metal) surface across different liquid media. Past works usually suggest that entropic effects on the Casimir force (originating partly from its zero frequency contribution that has an approximately linear temperature dependence) occur at high temperatures and/or large separations. We propose a new way to achieve a zero-frequency Casimir effect, which reveals the potential for a Casimir force quantum switching within nanometer distances-a scale often thought to be unattainable. Furthermore, the heterogeneous surface can have different phases (both metallic and insulating). Hence, our results introduce a new method to induce phase (stoichiometry)-controlled attraction-repulsion transitions and to achieve quantum levitation in a liquid medium by tuning the liquid environment. This study opens up new possibilities for manipulating the Casimir interactions between surfaces, forming the basis for advancements in nanoscale technology.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130162"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Rare events for low energy domain in bouncing ball model
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-01-28 DOI: 10.1016/j.physleta.2024.130161
Edson D. Leonel , Diego F.M. Oliveira
{"title":"Rare events for low energy domain in bouncing ball model","authors":"Edson D. Leonel ,&nbsp;Diego F.M. Oliveira","doi":"10.1016/j.physleta.2024.130161","DOIUrl":"10.1016/j.physleta.2024.130161","url":null,"abstract":"<div><div>The probability distribution for multiple collisions observed in the chaotic low energy domain in the bouncing ball model is shown to be scaling invariant concerning the control parameters. The model considers the dynamics of a bouncing ball particle colliding elastically with two rigid walls. One is fixed, and the other one moves periodically in time. The dynamics is described by a two-dimensional mapping for the variables velocity of the particle and phase of the moving wall. For a specific combination of velocity and phase, the particle may experience a type of rare collision named successive collisions. We show that a power law describes the probability distribution of the multiple impacts and is scaling invariant to the control parameter.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130161"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Probing the structural, electronic, magnetic, and optical properties of Zr(Fe/Mn)Al half-Heusler alloys for optoelectronic applications: A first-principles investigation
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-01-28 DOI: 10.1016/j.physleta.2024.130175
H. Saadi , H. Kerrai , L. Nait Aouzal , A. Zaim , M. Kerouad , M. El Bouziani
{"title":"Probing the structural, electronic, magnetic, and optical properties of Zr(Fe/Mn)Al half-Heusler alloys for optoelectronic applications: A first-principles investigation","authors":"H. Saadi ,&nbsp;H. Kerrai ,&nbsp;L. Nait Aouzal ,&nbsp;A. Zaim ,&nbsp;M. Kerouad ,&nbsp;M. El Bouziani","doi":"10.1016/j.physleta.2024.130175","DOIUrl":"10.1016/j.physleta.2024.130175","url":null,"abstract":"<div><div>In this study, we investigated the structural, electronic, magnetic and optical characteristics of the half-Heusler alloys ZrYAl (Y = Fe, Mn) using density functional theory with the Generalized Gradient Approximation plus Hubbard Coulomb correction (GGA+U). We determined the bulk modulus, lattice constant, and formation energy for both compounds, confirming their structural stability. Band structure analysis and density of states revealed that ZrMnAl exhibits half-metallic behavior, while ZrFeAl displays metallic characteristics. Additionally, both half-Heusler alloys exhibit ferromagnetic behavior, with magnetic moments of approximately 3.01 <span><math><msub><mrow><mi>μ</mi></mrow><mrow><mi>B</mi></mrow></msub></math></span> for ZrFeAl and 3.96 <span><math><msub><mrow><mi>μ</mi></mrow><mrow><mi>B</mi></mrow></msub></math></span> for ZrMnAl. Moreover, we calculated several optical parameters, including dielectric constants, absorption coefficients, reflectivity, and refractive index. The results suggest that these compounds possess intriguing features for spintronic and optoelectronic applications.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130175"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the anomalous density of a dilute homogeneous Bose gas
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-01-28 DOI: 10.1016/j.physleta.2024.130164
Abdulla Rakhimov , Mukhtorali Nishonov
{"title":"On the anomalous density of a dilute homogeneous Bose gas","authors":"Abdulla Rakhimov ,&nbsp;Mukhtorali Nishonov","doi":"10.1016/j.physleta.2024.130164","DOIUrl":"10.1016/j.physleta.2024.130164","url":null,"abstract":"<div><div>Measurement of numerical values of the anomalous density, <em>σ</em>, which plays important role in Bose – Einstein condensation, and, especially, determination of its sign, has been a long standing problem. We develop Hartree – Fock – Bogoliubov theory taking account arbitrary phase of the condensate wave function. We show that, the sign of <em>σ</em> directly related to the phase, and, hence is not observable. Despite this, its absolute value can be extracted from measurements of the sound velocity and condensed fraction. We present theoretical prediction for <span><math><mo>|</mo><mi>σ</mi><mo>|</mo></math></span> for a BEC in a uniform box.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130164"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimization modeling of automatic crowd regulation at bottlenecks of subway system: A model predictive control approach
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-01-28 DOI: 10.1016/j.physleta.2024.130180
Xiaoxia Yang , Baolong Shi , Guoqing Zhang , Yongxing Li
{"title":"Optimization modeling of automatic crowd regulation at bottlenecks of subway system: A model predictive control approach","authors":"Xiaoxia Yang ,&nbsp;Baolong Shi ,&nbsp;Guoqing Zhang ,&nbsp;Yongxing Li","doi":"10.1016/j.physleta.2024.130180","DOIUrl":"10.1016/j.physleta.2024.130180","url":null,"abstract":"<div><div>Optimizing crowd regulation through the setting of diversion railings at the bottleneck of subway stations is a precise and effective strategy to improve the traffic efficiency and safety of high-density crowds. The existing work mainly focuses on setting fixed railings based on management experiences, which lacks dynamic regulation strategies in the passage process. To address this issue, an automatic regulation optimization method for crowd under railings is provided based on the model predictive control. System identification methods are used to model the obtained flow data at bottlenecks based on the MassMotion, and a model predictive control system for railings, therefore, is constructed, with the length of the railing as the control input and the crowd density as the controlled object. Regulation commands have characteristics of simplicity and clarity, which can effectively intervene in the traffic state of high-density crowds, striking an optimal balance between safety and efficiency.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130180"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An atomistic interpretation of viscous flow in liquid metal elements
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-01-28 DOI: 10.1016/j.physleta.2025.130312
Lianwen Wang
{"title":"An atomistic interpretation of viscous flow in liquid metal elements","authors":"Lianwen Wang","doi":"10.1016/j.physleta.2025.130312","DOIUrl":"10.1016/j.physleta.2025.130312","url":null,"abstract":"<div><div>For the microscopic mechanisms of viscous flow, we are still at the age of 1930s when Andrade proposed atoms conveyed momentum to a neighboring drift plane by vibrating across the plane. For the lack of the properties of liquids, the most intriguing part of atomic migration, namely, “friction by transport” that Andrade called the mechanism of viscosity for shortness, remains untackled. In this work, on basis of our atomistic model for liquid diffusion, the process of viscous flow in liquids is examined in view of atom migrations. The friction force exerted on the migration atoms can be estimated from the activation energy of vacancy migration. Accordingly, the instantaneous shear moduli of liquid metal elements and its’ temperature dependence are derived and verified with reported measured data. On this basis, an <em>a priori</em> atomistic calculation of viscosity is presented as a reference considering the unavoidable contamination of turbulent flow in experiment. Finally, the Stokes-Einstein relation is re-examined in terms of the present discussion of liquid viscosity.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"537 ","pages":"Article 130312"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143136338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Indefinite causal order for parameter estimation of channel with depolarization noise
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-01-28 DOI: 10.1016/j.physleta.2024.130163
Yongxi Yuan
{"title":"Indefinite causal order for parameter estimation of channel with depolarization noise","authors":"Yongxi Yuan","doi":"10.1016/j.physleta.2024.130163","DOIUrl":"10.1016/j.physleta.2024.130163","url":null,"abstract":"<div><div>When incorporating the indefinite causal order method into quantum channel parameter estimation, the target parameter information of the channel can be encoded into the control qubit, and the ultimate precision upper limit can be assessed using quantum Fisher information. In this study, we examine the characteristics of a switched channel in which a single path contains multiple copies of a qubit unitary channel affected by depolarization noise. Our focus lies on the superposition coupling term generated by the switched channel, as it plays a crucial role in determining the quantum Fisher information for parameter estimation. In addition, we classify and discuss the case where a single path contains three copies. Given that the quantum Fisher information is determined by the coupling terms, we rigorously compute the values of these coupling terms in all scenarios. Subsequently, we analyze the characteristics of the quantum Fisher information and compare them with those arising from two copies of a single path.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130163"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nonlinear wave dynamics under the presence of a strong horizontal electric field and a bathymetry
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-01-28 DOI: 10.1016/j.physleta.2024.130166
M.V. Flamarion , E. Kochurin , R. Ribeiro-Jr , N. Zubarev
{"title":"Nonlinear wave dynamics under the presence of a strong horizontal electric field and a bathymetry","authors":"M.V. Flamarion ,&nbsp;E. Kochurin ,&nbsp;R. Ribeiro-Jr ,&nbsp;N. Zubarev","doi":"10.1016/j.physleta.2024.130166","DOIUrl":"10.1016/j.physleta.2024.130166","url":null,"abstract":"<div><div>In this letter, we explore free-surface flow of an ideal dielectric liquid subjected to a strong tangential electric field in the presence of variable bottom topographies. Analytically, we demonstrate that nonlinear waves of arbitrary shape can propagate at a critical speed without distortion, provided they are in resonance with a moving localized obstacle at the bottom. Numerical solutions of the full model for various obstacle types yield two key results: (i) For localized obstacles, a wave forms above the obstacle, then splits into symmetric waves traveling in opposite directions at the same speed and a stationary disturbance formed due to electric field inhomogeneities. (ii) Periodic spatial bathymetries induce periodic motion in both space and time. Additionally, considering traveling solitary waves, we show that a small dispersive tail arises when they interact with the bathymetry.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130166"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Searching for the sizable atomic-scale magnetism: A comparative study of boron/hydrogen chemisorbed on topological defects in graphene
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-01-28 DOI: 10.1016/j.physleta.2024.130176
Shuai Zhang , Bin Cui , Chunyao Niu , Fei Wang , Chong Li , Yu Jia
{"title":"Searching for the sizable atomic-scale magnetism: A comparative study of boron/hydrogen chemisorbed on topological defects in graphene","authors":"Shuai Zhang ,&nbsp;Bin Cui ,&nbsp;Chunyao Niu ,&nbsp;Fei Wang ,&nbsp;Chong Li ,&nbsp;Yu Jia","doi":"10.1016/j.physleta.2024.130176","DOIUrl":"10.1016/j.physleta.2024.130176","url":null,"abstract":"<div><div>Recent experiments have identified that both boron (B) and hydrogen (H) atoms might induce atomic-scale magnetism on graphene. Using the first-principles calculations and analyses, we show that B adatom chemisorbed on 48-type topological defects in graphene not only enhances the adsorption energy dramatically, but also significantly induces a sizable atomic-scale spin moment 1.08 μ<sub>B</sub>. The underlying mechanism can be attributed to the abundant charge transfer of B adatom and local bonding environment (B/tetragonal ring), facilitating to form B-C covalent bonds. However, such spin polarization does not happen on 558-type defects. In sharp contrast, H adatom can not induce sizable atomic-scale magnetism on either 48- or 558-type defect. We further identity that the moderate kinetic barrier of B adatom along 48-type line defect makes it highly possible to achieve stable antiferromagnetic spin chain. Our findings might provide another feasible host material to realize stable and sizable atomic-scale magnetism of B adatom.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130176"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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